Stop me if you've heard this one.
A mechanical engineer, a chemical engineer, and a computer engineer are driving through the desert when their car starts making horrible choppy noises before stalling out.
The mechanical engineer mutters "its that darn intake manifold again" and pops the hood.
The chemical engineer muses "I wonder if this desert heat is causing some vapor lock in the fuel pump" and goes out under the rear quarter panel to have a look.
The computer engineer says nothing, but quietly gets out of the car, and shuts the driver side door. Then he re-opens the door, and slides into the driver seat.
The car starts right up.